61N-W0078-01 Water Pump Impeller Kit for Yamaha C30 F25 F25A F25B | JLM Marine

Water Pump Impeller Kit – Fits Yamaha 2-Stroke 30HP & 4-Stroke 25HP Outboards

This water pump impeller kit is engineered for reliable cooling performance on Yamaha 2-stroke 30HP and 4-stroke 25HP outboard engines. Designed to fit C30 (1993-97), F25 (1998-05), F25A (2009-17), and F25B (2012-17) models, this kit ensures your engine maintains optimal operating temperature.

Direct replacement for Yamaha OEM part numbers 61N-W0078-00, 61N-W0078-0A, 61N-W0078-01, 61N-W0078-10, 61N-W0078-14, and Sierra Marine 18-3432. This aftermarket kit delivers dependable cooling system performance at a competitive price.

• Complete kit includes impeller, key, O-ring, and water seal
• Compatible with both 2-stroke and 4-stroke Yamaha engines
• Essential maintenance component for preventing engine overheating

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Yamaha owners, here's a guide to help you identify your engine's serial/model: Yamaha Serial Number Guide. You can also review exploded diagrams to verify part numbers: Yamaha Parts Diagrams & Catalog.

Technical Specifications

Package Contents

This complete water pump impeller kit includes the following components:

• 1 × Water Pump Impeller (6H4-44352-02-00)
• 1 × Key, Impeller (90280-03M03-00)
• 1 × O-Ring (93210-45161-00)
• 1 × Seal, Water (6L2-44367-00-00)

Installation Guide

1. Disconnect the fuel line and remove the engine cowling to access the lower unit. Ensure the engine is cool before beginning work.
2. Remove the propeller and drain the lower unit gear oil completely.
3. Unbolt and separate the lower unit from the midsection. Take care not to damage the driveshaft or water tube.
4. Remove the water pump housing and take out the old impeller, noting its orientation.
5. Clean all surfaces thoroughly and inspect the pump housing and plate for wear or scoring.
6. Install the new O-ring and water seal into their designated grooves, applying a light coat of marine grease.
7. Insert the impeller key into the driveshaft slot.
8. Lubricate the new impeller blades with glycerin or dish soap, then install it with the blades oriented in the correct rotation direction.
9. Reassemble the pump housing, ensuring the water tube seats properly into the grommet.
10. Reattach the lower unit to the midsection, aligning the driveshaft and water tube carefully.
11. Refill the lower unit with fresh gear oil and reinstall the propeller.
12. Test the water pump by running the engine with a flusher or in a test tank, confirming strong water flow from the telltale.

Troubleshooting & FAQ

Q: How do I confirm this kit fits my Yamaha engine?
A: Cross-reference your engine model and year with the compatibility table above. Verify your current impeller kit part number matches one of the OEM numbers listed (61N-W0078-00, 61N-W0078-0A, 61N-W0078-01, 61N-W0078-10, or 61N-W0078-14).

Q: How often should I replace my water pump impeller?
A: Yamaha recommends replacing the impeller every 2-3 years or 200-300 hours of operation, whichever comes first. Replace immediately if you notice reduced water flow, overheating, or visible blade damage.

Q: What are the signs of a failing water pump impeller?
A: Common symptoms include weak or no water stream from the telltale hole, engine overheating warnings, steam from the engine, or visible cracks and missing pieces on the impeller blades.

Q: Can I install this kit myself or do I need a mechanic?
A: If you have mechanical experience and the proper tools, you can install this kit yourself following the guide above. However, if you're unfamiliar with lower unit disassembly, professional installation is recommended to avoid damage.

Q: Is this an OEM or aftermarket impeller kit?
A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?
A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?
A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.